Discussion
Why does a frequency error make SSB music unlistenable but speech usable?
Answer: B
Every component shifts by the same absolute amount, so the harmonic series is no longer harmonic and music sounds discordant, while speech intelligibility depends more on formant patterns and survives a shift of tens of hertz. Bandwidth is not the issue. Speech certainly has harmonics; they are simply less critical to recognition. And no SSB receiver uses envelope detection, whatever the programme material. The pattern repeats across the family: what the transmitter sheds, the receiver must supply.
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